Hi!
> > Starting beeper as soon as ACPI sleep returns is very useful in
> > debugging "apparently dead" machines. If it beeps at all, it makes
> > sense to start playing with CMOS tracer.
> >
> > Signed-off-by: Pavel Machek <[email protected]>
> >
> > diff --git a/arch/i386/kernel/acpi/wakeup.S b/arch/i386/kernel/acpi/wakeup.S
> > index b781b38..cbf136e 100644
> > --- a/arch/i386/kernel/acpi/wakeup.S
> > +++ b/arch/i386/kernel/acpi/wakeup.S
> > @@ -11,7 +11,22 @@ # Do we need to deal with A20? It is oka
> > #
> > # If physical address of wakeup_code is 0x12345, BIOS should call us with
> > # cs = 0x1234, eip = 0x05
> > -#
> > +#
> > +
> > +#define BEEP \
> > + inb $97, %al; \
> > + outb %al, $0x80; \
> > + movb $3, %al; \
> > + outb %al, $97; \
> > + outb %al, $0x80; \
> > + movb $-74, %al; \
> > + outb %al, $67; \
> > + outb %al, $0x80; \
> > + movb $-119, %al; \
> > + outb %al, $66; \
> > + outb %al, $0x80; \
> > + movb $15, %al; \
> > + outb %al, $66;
> >
> > ALIGN
> > .align 4096
> > @@ -20,6 +35,9 @@ wakeup_code:
> > wakeup_code_start = .
> > .code16
> >
> > +# Uncomment this to make your computer start producing ugly noise as soon
> > +# as BIOS returns to this real-mode entry point.
> > +# BEEP
> > movw $0xb800, %ax
> > movw %ax,%fs
> > movw $0x0e00 + 'L', %fs:(0x10)
> >
>
> How does the beep get turned off again?
Typically, pcmcia beeps after resume, making it quiet. If not, echo ^G
does it.
> Should the BEEP line be uncommented (in -mm at least)?
It's too gross a hack, I'd say. It is only ever useful if machine is
completely dead after s2ram.
Pavel
--
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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